Zener Diode Voltage Regulator & Resistor Sizing Calculator
Calculate series ballast resistor (Rs), power dissipation, and diode wattage rating to maintain stable shunt regulation under fluctuating DC input voltages.
Zener & DC Supply Specifications
V
V
V
mA
mA
mA
Series Ballast Resistor (Rs)
STABLE SHUNT REGULATION
150 Ω (Max: 156 Ω)
Selected nearest standard E24 resistor value ≤ 156.0 Ω
Resistor Power (PRs,max)
528 mW
Recommended: ≥ 1.0 Watt
Zener Power (PZ,max)
303 mW
Recommended: ≥ 0.5 Watt (500mW)
Worst-Case Current Breakdown
Peak Zener Current (No-Load @ Vin,max):
59.3 mA
Minimum Zener Current (Full-Load @ Vin,min):
6.0 mA (Safe > 5.0 mA)
Regulation Circuit Efficiency:
25.8% (Shunt Dissipation)